CYLINDER – Indicates if an astigmatism is present. Astigmatism is a measure of how curved the cornea is.

AXIS – This is a number from 0 to 180 indicating the direction of the Astigmatism

NEAR ADD – Indicates Presbyopia, a condition where reading specs are needing generally at the age of 40+. This power is added to the distance prescription in order to bring a near object in focus. Usually this is a number in the range of +0.50 to +3.50